Light meters are interesting things. At their humble beginnings, they were highly manual devices where the photographer added or removed density filters until the correct exposure was achieved. Now every digital camera has a built-in meter. In the studio, they are invaluable for calculating ratios, which saves valuable time guessing exposure ratios while others wait patiently.
Here are a few from my collection.
Weston Master I (UK version, model 735 1939-1946)
Weston Master II (UK version 1946-1956)
Sekonic L-398 Studio Deluxe 1976-2006)
Sekonic L-8 (1960's)
Ultima PR-75 (date unknown)
Gossen Luna Pro (1961-1966) (the one I have with me most often for street photography
They all work, and the 358 is still available new. For most work I use the terrific Sekonic digital L-758.